TW201426684A - Digital encryption method by multiple encryption - Google Patents

Abstract

Disclosed is a method of digital encryption by multiple encryption utilizing the existing encryption method, in which the plaintext and ciphertext show one to one characteristic, to ensure that after several times of encryption, the maximum (minimum) value of the ciphertext is the same as the maximum (minimum) value of the plaintext (i.e. the value field of the ciphertext equals to the value field of the plaintext), and to confirm that after encryption of digital field, the plaintext and ciphertext formats are unchanged. This invention mainly solves the difficulty of digital (decimal) encryption, and expects to still guarantee the value field of the ciphertext is not greater than the value field of the plaintext after encryption. For example, if the value field of the plaintext is 0-9, 4-bits is needed to represent, leading to value field of intermediate ciphertext is 0-15. But with this method, the final value field of the ciphertext is reduced to 0-9, which is consistent with the value field of plaintext. This invention proposes a method of using multiple encryptions to reduce the value field of the ciphertext, which is a non-conventional approach.

Description

Method for digital encryption with multiple encryption

The invention relates to a method for digital encryption by multiple encryption, in particular, the pointer is designed for digital encryption, and the value range of the plaintext ciphertext can be kept consistent.

The general encryption method commonly used today (designed for non-digital encryption), whether it is symmetric or asymmetric, block mode or streaming mode, because it is processing digital data, it is in the form of a byte or bit Unit calculation, in the processing of digital data, this feature can not only speed up the operation, but also correctly handle the encryption and decryption functions. However, when used in digital encryption and decryption, it causes the maximum number of ciphertexts to be larger than the maximum number of plaintext digits. This does not apply to digital encryption systems that require a consistent ciphertext format.

For digital encryption, Baffe Boyois proposed a method in the stackoverflow forum, which is consistent with this patent, and is applicable to digital encryption, and the ciphertext value range is consistent with the plaintext range. Its practices and technical characteristics are:

1. Practice: Encrypt each single digit in plaintext (for example, if the plaintext 10 carry value is 213, then 2, 1, and 3 are each encrypted), and select a keystream (keystream) to continuously take 4-bits until this The value of the 4-bit component (10-bit) is between 0-9, and the plaintext is added, and the modulo operation is performed (the bottom is 10). This value is the ciphertext.

2. Technical characteristics: by repeatedly selecting the key from the keystream until the appropriate key is selected (the value is not more than 10) and the modulo operation is performed (the bottom is 10) to ensure the correctness of the decryption and the ciphertext value range and the plaintext. The values are consistent.

To this end, the applicant has in view of the above-mentioned conventional encryption method, upholds the spirit of research and innovation, and strives for excellence, and uses its professional vision and professional knowledge to study the method of digital encryption using multiple encryptions.

The object of the present invention is to provide a method for digital encryption by multiple encryption, which is mainly designed to achieve the uniformity of the digital format (maximum value) of the ciphertext.

A second object of the present invention is to provide a method for performing digital encryption using multiple encryptions, for example, to ensure that the digital portion of the identity card number retains the characteristics of a nine-digit number after being encrypted.

A further object of the present invention is to provide a method for digital encryption by multiple encryption, which can ensure the consistency of the ciphertext value domain through multiple encryptions based on the current universal encryption method (not applicable to digital). .

In order to achieve the above-mentioned object of the present invention, a method of digitally encrypting with multiple encryptions, and ensuring that the value range of the final ciphertext is equal to the plaintext range, the ciphertext can be kept in the same format as the plaintext. Mainly when the plaintext is encrypted, if the obtained temporary ciphertext value is greater than the plaintext value range (for example, if the plaintext value field is 0-9 and the temporary ciphertext value is 10, the plaintext value field is exceeded), then the temporary ciphertext is used. The value continues to be encrypted until the temporary ciphertext value falls to the plaintext value range (in the above example, the temporary ciphertext value needs to be 0-9), and the ciphertext value is regarded as the final ciphertext value to complete the encryption process. The present invention provides a method for digital encryption by multiple encryption, the steps of which are: Step 1: input a plaintext value; Step 2: The plaintext value is calculated by a general encryption method unit to generate an intermediate temporary ciphertext value; 3: A value range determining unit determines whether the intermediate temporary ciphertext value is within a range of the plaintext value, and if the intermediate temporary ciphertext value is not within the range of the plaintext value, then Step 2 is repeated, in which case the intermediate temporary ciphertext value is regarded as a plaintext; Step 4: if the intermediate temporary ciphertext value is within the range of the plaintext value, the intermediate temporary ciphertext value is regarded as a last Ciphertext output value.

In view of this, the method for digital encryption by multiple encryption provided by the present invention has the following advantages when compared with other conventional technologies:

1. After multiple encryptions, the final ciphertext value range can be kept consistent with the plaintext value field. That is, after multiple encryptions, a ciphertext value is obtained, and its value falls within the plaintext value range. This is a non-practical method of narrowing down the ciphertext value range by multiple encryptions.

2. There is an upper limit (ie, feasibility) for ensuring the number of encryptions required for encryption. (The maximum number of encryptions required is the number of elements in the middle ciphertext value field - the number of elements in the plain text value field is +1)

The technical features, contents, and advantages of the present invention, as well as the advantages thereof, can be understood by the reviewing committee, and the present invention will be described in detail with reference to the accompanying drawings. The subject matter is only for the purpose of illustration and description. It is not intended to be a true proportion and precise configuration after the implementation of the present invention. Therefore, the scope and configuration relationship of the attached drawings should not be interpreted or limited. First described.

The present invention is directed to a digital encryption method designed by a digital encryption requirement system. Under the existing encryption method, the value of the last generated ciphertext falls within the value range of the plaintext through multiple encryptions, in order to reach the ciphertext. Consistent with the plaintext format. Please refer to FIG. 1 , which is a flowchart of a method for digitally encrypting by multiple encryption according to the present invention. As can be seen from FIG. 1 , the steps of the present invention are as follows:

Step 1: An input of the plaintext value 102 passes through the general encryption method unit 101.

Step 2: An intermediate temporary ciphertext value 103 is generated by the general cryptographic unit 101.

Step 3: The value range determining unit 104 determines whether the intermediate temporary ciphertext value 103 exceeds the plaintext value field. If the intermediate temporary ciphertext value 103 is greater than the plaintext value field 105, step 1 is repeated, and the intermediate temporary ciphertext value 103 is next. The steps will be treated as plaintext 102 and continue to be encrypted;

Step 4: If the intermediate temporary ciphertext value 103 falls within the plaintext value field 106, the intermediate temporary ciphertext value 103 is taken as the last ciphertext output value 107.

The method of digitally encrypting as described above, wherein the general cryptographic unit includes all symmetric or asymmetric cryptography. The value range of the plaintext value can be adjusted according to requirements, and the range of the value of the last ciphertext output value is consistent with the range of the plaintext value. The value range of the range determining unit is defined according to the range of the value of the ciphertext value, and whether the temporary ciphertext value is within the range of the plaintext value.

Wherein, the intermediate temporary ciphertext value obtained in step 3, whether after the first encryption, if the newly generated intermediate temporary ciphertext value is not within the range of the plaintext value, repeat step 2, and then execute One encryption, and the plaintext value of this encryption is the intermediate temporary ciphertext value of the previous encryption.

The general acquaintance encryption method is used. Since it is not designed for digital encryption, and the unit is a binary unit, if the application is used in decimal digit encryption, the value of the ciphertext is larger than the plaintext.

The above-mentioned embodiments are intended to be illustrative only and not to limit the scope of the present invention. Any equivalent modifications and changes thereto are not included in the spirit and scope of the present invention. In the scope.

101‧‧‧General Encryption Unit

102‧‧ ‧ express value

103‧‧‧Intermediate temporary ciphertext value

104‧‧‧Value field judgment unit

105‧‧‧ Greater than the plaintext range

106‧‧‧ falls within the plaintext range

107‧‧‧Last ciphertext output value

Figure 1 is a flow chart of the present invention.

101‧‧‧General Encryption Unit

102‧‧ ‧ express value

103‧‧‧Intermediate temporary ciphertext value

104‧‧‧Value field judgment unit

105‧‧‧ Greater than the plaintext range

106‧‧‧ falls within the plaintext range

107‧‧‧Last ciphertext output value

Claims (5)

A method for performing digital encryption by multiple encryption, the steps of which are: Step 1: input a plaintext value; Step 2: the plaintext value is calculated by a general encryption method unit to generate an intermediate temporary ciphertext value; Step 3: The value domain determining unit determines whether the intermediate temporary ciphertext value is within the range of the plaintext value, and if the intermediate temporary ciphertext value is not within the range of the plaintext value, repeat step 2 again. The intermediate temporary ciphertext value is regarded as a plaintext; Step 4: If the intermediate temporary ciphertext value is within the range of the plaintext value, the intermediate temporary ciphertext value is regarded as a final ciphertext output value. A method for digitally encrypting by multiple encryption as described in claim 1 of the patent application, wherein the general cryptographic unit includes all symmetric or asymmetric cryptography. The method for digitally encrypting by multiple encryption as described in the first aspect of the patent application, wherein the range of the plaintext value can be adjusted according to requirements, and the range of the value of the last ciphertext output value and the plaintext value The range of values is the same. The method for digitally encrypting by multiple encryption according to the first aspect of the patent application, wherein the range of the range determining unit is determined according to the range of the value of the clear ciphertext, and the intermediate temporary ciphertext is determined. Whether the value is within the range of the plaintext value. The method for digitally encrypting by multiple encryption as described in claim 1, wherein the intermediate temporary ciphertext value obtained in step 3, whether after the first encryption, if the intermediate temporary ciphertext value is not between Within the range of the plaintext value, step 2 is repeated, and then the encryption is performed once, and the plaintext value of the encryption is the intermediate temporary ciphertext value of the previous encryption.